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  1. 1
    por Henderson, Allan
    Publicado 1987
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    Libro
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    Gardado en:
    Applied behaviour analysis in education : a resource teacher's handbook /
  2. 2
    por Wills, Diane
    Publicado 1980
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    Libro
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    Gardado en:
    The use of a token economy as a system of behaviour management in a special class /

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